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A source said: "Initially this was a missing persons and her sister went to the gardai to report that she was not returning phone calls.

"Natalia was a very loving mother and had left her kids - it is now believed that she was murdered in a fit of jealous rage after a party.

"She was then taken and dumped in woodland."

Gardai had arrested a man in relation to the disappearance when his movements on CCTV did not match his initial claimed movements.

A source added: "Gardai questioned the man but he did not make any admissions - then when the body was discovered his story came crashing down and he went back to the garda station."

(Image: Philip Mulligan Photography)

Sources have said the suspect flew into a jealous rage after the party.

The source added: "The belief of investigators is that this man, who is believed to have killed her, flew off the handle and killed her in a crime of passion.

"He then panicked and tried to cover up his crime but as is always the way the cover up fell apart when gardai examined CCTV."

Natalia was out with friends on Saturday - she went first to the cinema and enjoyed a night out.

She then went to a house party in the Crozon Inn area of Sligo where she was spotted walking home to Crozon Park at 6.30am on Sunday morning.

That was the last sighting of the much loved woman alive.

A body was discovered by gardai, acting on information, on Tuesday morning. It is believed to be that of missing Natalia. This has yet to be confirmed.

The man who was arrested originally was re-arrested shortly after the discovery. Gardai can rearrest a suspect when they have new information or evidence in an investigation.

Natalia's sister Magdalena McMorrow had made a desperate appeal for help from locals to find her sister.

She was informed by gardai of the tragic find and was being comforted by loved ones yesterday.

The Irish Mirror spoke briefly to Magdalena but she said she was too distressed to talk about her sister.

In a Facebook post earlier she had pleaded for help: "Please if you have any information, seen her or maybe have CCTV outside your house in the area, get in touch with Sligo Garda Station or myself. We are all very concerned and want her back safe."

Natalia's children were being cared for also as the Polish community in Sligo rallied around to lend their support.

Councillor Seamus Kilgannon, the chairman of Sligo County Council, spoke on behalf of the town's people about their shock at the horrific murder.

He said: "On behalf of the members of Sligo County Council and on my own behalf I would like to express our deepest sympathy with the family.

"It is a terrible tragedy to happen in any area but when it happens so close to home you start realising the difficulties and dangers that are out there.

"All our thoughts are with this poor woman's family and friends and hope that who ever is responsible would be brought to justice and be dealt with by the authorities.

"I would appeal to anyone with information to contact the gardai and I feel they will get full co-operation."

(Image: Philip Mulligan Photography)

A Garda spokesman said that officers had arrested a man and he was being detained for questioning under Section 4 of the Criminal Justice Act.

Earlier they said: "Gardai investigating the disappearance of Natalia Karaczyn have located a body. Gardai discovered a body in an area of open ground near Carns, Sligo this morning.

"The body has not been formally identified. The office of the State Pathologist has been notified and the Garda Technical Bureau are at the scene.